Calderon, S. G. (1974). Kalendaryo ng bayan, taong 1918 [microform]. Photoduplication Service, University of the Philippines Library.
Citace podle Chicago (17th ed.)Calderon, Sofronio G. Kalendaryo Ng Bayan, Taong 1918 [microform]. Quezon City: Photoduplication Service, University of the Philippines Library, 1974.
Citace podle MLA (9th ed.)Calderon, Sofronio G. Kalendaryo Ng Bayan, Taong 1918 [microform]. Photoduplication Service, University of the Philippines Library, 1974.
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